Model # FB50

Internet #100122448

Store SKU #839531

Store SO SKU #1000063652

Custom Building Products FlexBond Gray 50 lb. Fortified Thin-Set Mortar
0010186269849

Custom Building Products

FlexBond Gray 50 lb. Fortified Thin-Set Mortar

  • Premium quality, excellent bond strengths
  • Protects against cracking
  • Second step to achieving a lifetime warranty
$30.47 /each

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Product Overview

This Custom Building Products FlexBond 50 lb. Fortified Thin-Set Mortar is a premium-quality, polymer-modified mortar with exceptional flexibility and bond strength. FlexBond is perfect for tiling difficult surfaces, such as plywood, vinyl and laminates and for hard to bond non-porous tile such as porcelain and glass. FlexBond protects against cracking caused by minor in-plane surface movement.

California residents: see   Proposition 65 information

  • Suitable substrates include interior and exterior floors, countertops and walls
  • Can tile directly over cracks up to 1/16 in. without repairs
  • Suitable tile types also include natural stone, brick and thin brick
  • Exceeds ANSI A118.4 and A118.11 standards without the need for additives
  • Dries in 24 hours
  • Resists mold and mildew
  • Qualifies for a lifetime system warranty



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Customer Questions & Answers

Can this be used for ceramic tile over plywood?

Asked by: Chris
NEVER install ceramic tile directly on plywood. Why? The plywood expands and contracts with humidity and temperature changes. Very slightly, but it does move. Ceramic or porcelain tile will move too, but SIGNIFICANTLY less than plywood. What happens when plywood is shrinking or expanding, and the tile can't keep up? Cracks, grout joints crumbling, and tile coming loose. Use some backer system - a concrete board or uncoupling membrane.
Answered by: WeaversCarpetAndTile
Date published: 2016-12-05

I'm laying a 5/16 in thick (10in x 14in) ceramic tile. As this tile is almost at the 15in thresh...

I'm laying a 5/16 in thick (10in x 14in) ceramic tile. As this tile is almost at the 15in threshold, should I use "Flexbond" or the "Natural Stone and Large Tile" mortar??
Asked by: John
I would probably use large tile thinset, but I'm sure either one will work just fine if the application process is correct.
Answered by: Dawn
Date published: 2017-01-27

What is set time before you can walk on the tile

Asked by: lm
24 hours
Answered by: Chilly558
Date published: 2016-11-02

What is the dry time at 50 degrees?

Asked by: Mike
Not sure. It sets up at 60 degrees in 18 hours, to the point that you can step on the tile without worry. I would wait at least 24 hours at 50 degrees.
Answered by: JimD
Date published: 2017-01-31
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Customer Reviews

FlexBond Gray 50 lb. Fortified Thin-Set Mortar is rated 4.5 out of 5 by 63.
Rated 4 out of 5 by from So far so good. This thin-set mortar remains workable for an hour, which gives me time to get ed... So far so good. This thin-set mortar remains workable for an hour, which gives me time to get edge and corner tiles installed without worrying about the mortar setting up before I'm through. I have completed two bathrooms, and probably won't know for years how good it is at "crack prevention". It mixes quickly with water, with minimal problems with lumps remaining in the mortar after mixing. It costs just under $30 before tax at my local store, which seems expensive, but the relatively slow setting is worth it to me. I have about 2,000 square feet of tile to lay in the rest of the basement, and will use this product despite the high price.
Date published: 2017-01-31
Rated 5 out of 5 by from There seems to be a lot of confusion over what this mortar is. Custom Building Products makes a w... There seems to be a lot of confusion over what this mortar is. Custom Building Products makes a wide range of mortars, and The Home Depot sells much of that range. FlexBond is Custom's most heavily modified general-purpose thinset mortar. It is designed to be used for every tiling application that thinset mortar is used for: ceramic, porcelain, glass, stone, and brick tile. FlexBond comes in both white and gray colors. The gray here is the general-purpose mortar that is used in most applications. The white is used for installing transparent, translucent, or thin light-colored tile, wherever the gray mortar may end up making tiles look darker. FlexBond is NOT a medium-bed mortar and NOT designed to hold up heavy, large tiles and keep them from settling and moving over their drying period. FlexBond should not be used for anything larger than 12x12-inch tile, a common size, if keeping the tile from settling is a major concern. FlexBond dries harder and is initially stickier to succcessfully adhere to a larger variety of substrates during installation. This is what you use for your critical installs, where you need to give your tile the best possible chance of staying where you put it, or where you're clearly trying to stretch the limitations of the tiling method you're using. Despite it's higher price, this mortar is often worth a DIYer's consideration because it's much more bulletproof than something much less expensive, like VersaBond. Fewer things can go wrong, and the quality of the materials can often help someone with limited tiling skills get the job done with a higher rate of success. Be sure to clean your tools carefully when you're done with them. This stuff gets very hard and you might never be able to use the tools again if you leave them caked with mortar for a few hours.
Date published: 2016-11-03
Rated 1 out of 5 by from The product is fine, Home depot storage was the problem. It was full of hardened clumps and I end... The product is fine, Home depot storage was the problem. It was full of hardened clumps and I ended up throwing out over half the bag at my expense. It is nearly impossible to check for moisture clumping unless there are obvious signs on the exterior of the bag.
Date published: 2017-01-07
Rated 5 out of 5 by from Easy to work with...even for a rookie. I ended up using way more than I expected to, presumably because I laid it out thicker than I needed to. My only gripe is when I bought all my materials for my job back in July, there was no mention on the bags that this product was not appropriate for tiles with side > 15". In fact, the product description and picture online still make no mention of that limitation. When I went to HD to purchase additional bags, the bags say it is for 15" or less. I didn't want to change products, so I bought more bags of the Flex Bond. I will be very disappointed if the product fails
Date published: 2016-10-11
Rated 5 out of 5 by from I was laying long, imitation wood-like plank tiles (up to 36" in length) onto virgin cement board... I was laying long, imitation wood-like plank tiles (up to 36" in length) onto virgin cement board. The product was easy to apply and held the tiles in place. It has been several months and I do not see any tile movement or cracks in the tiles. Flexbond makes a mortar with even more flex for longer tiles like my application, but that type of mortar is not sold in PA stores.
Date published: 2016-11-02
Rated 4 out of 5 by from Flexbond (both white and grey) is a great and preferred type of thinset for laying tile in the sh... Flexbond (both white and grey) is a great and preferred type of thinset for laying tile in the shower - I have used it in multiple applications. It covers wells, sticks well, but dries very fast, so don't mix too much, and do apply some extra on each tile if it started drying on the wall faster than you wished.
Date published: 2016-12-20
Rated 5 out of 5 by from I've used this stuff for a long time. And a lot of it! It's certainly more expensive than some bu... I've used this stuff for a long time. And a lot of it! It's certainly more expensive than some but there's a reason for that. You don't want to risk using cheaper material. It could mean replacing tiles or an entire floor!
Date published: 2017-02-28
Rated 4 out of 5 by from FlexBond Fortified Thin-Set I used this thin-set for an external slate tile project. It is a bit difficult to mix but has worked well in the actual tile setting. Too early to tell if expansion and contraction will be an issue that results in cracks.
Date published: 2016-12-06
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